Furnace for burning fine coal



(No Model.)

A. HARDT.

PURNAGE FOR BURNING FINE GOAL.

No. 340,781. PatentedApr. 27, 1886.

WITNB Es: I r V INVBNTOR;

.7M v n# ATTORNEYS.

Nv ferias. Pham-Lahnmpher. wmnngmn, D. a

' `UNITED STATES PATENT OFFICE.

ANTONYHARDT, OF IVELLSBOROUGH, PENNQYLVANIA.

FURNACE FOR BURNINGFINE COAL.

Application filed February 5. 1886. Serial No. 190.935.

To @ZZ whom, it may concern;

Be it known tha't I, ANTON HARDT, of Wellsborough, in the county of Tioga and State of Pennsylvania, have invented a new and use ful Improvement in Furnaces for Burning Fine Coal, of which the following is a specification.

The object of my invention is to provide a furnace wherein soft (bituminous or semi-bituminous) coal screenings, commonly called line c0al,7 slack, or culm,7 may be used either alone or in combination with hard (anthracite) coalscreenings or coke screenings, whereby such screenings, which are gen erally considered as useless material, may be utilized for the purpose of generating heat, to be used in all sorts of manufacturing establishments, as well as in locomotives, Snc.

Reference is to be had to the annexed drawings, forming part of this specification, in which Figure l is a longitudinal sectional viewof a portion of my furnace for burning line coal. Fig. 2 is a vertical sectional view taken on line x x in Fig. l. Fig. 8 is a front elevation ,of the furnace.

Similar-letters of reference indicate corre' spending parts in the different figures of the drawings.

In constructing such a furnace as is illustrated in the drawings above rel'erred to I provide an ordinary form of tire-boiLA, above which I inount'two retorts, B B, said retorts being made of fireclay and being similar to those ordinarily employed in gas-works. The retorts I3 B rest upon and are supported by the boiler-front and by water-pipes a a, as clearly shown in Fig. l. In the bottom of each retort there is an opening, b, arranged to be closed by a slide, C, said slide being mounted in ways c @,and being made of ire-clay,while near the rear end of each retort thereis a fireclay tube, E, which extends upward within the retort to a point near its top, and downward within the lire-box A. Doors F F, provided with peep-holes f f, are arranged to close the forward open end of each of the retorts, and just below the retorts there are openings h h, closed by shutters h It', the firebox being provided as usual with a door, N.

Such is the general construction of the furnace, which operates substantially in the inanner to be now set forth. The tire is started in "PCIFICATIGN forming part of Letters Patent No. 310,781, dated April 27, 1886.

(No model.)

the usual way on the grate M, and when the retorts B Bare sufficientlyhot they are charged with fine coal. After time enough has elapsed to convert the fine coal or screenings to what I call semi-coke,77 one of the slides Gis drawn forward by means of an implement inserted through one of the openings l1., and formed to engage with a lug, a, formed ou the slide C. W`hen the slide C is pulled forward, the niaterial contained within the retort drops down upon the fire, being shoved and drawn to the opening, as will be readily understood. After one retort has been emptied it is again filled with line coal, and as soon as required the second retort is emptied and then refilled, it bcing understood that the two retorts are used alternately-that is to say, while the coking process is going on in one retort the material in the other retort, which has been partially cohed, is being fed to the lire-box. The gas that is driven out of the material placed in the retort passes through the tubes l1) E into the lire-box, where it ignites and furnishes additional heat.

Not only will a furnace constructed as described coke and burn slacl; and screenings, thereby utilizing a comparatively worthless fuel, but the loss of heat caused by opening the fire-box door is entirely avoided, and it will be readily understood that even il' a portion of the material placed in the retorts should become too greatly heated and converted into coke there would be nothing lost, as the gases generated would all have been used as fuel in the irebox. It will also be understood that if the supply of semi-coke from the retorts is not suflicient to supply any unexpected or eX- traordinary amount of heat, that additional vfuel could be introduced to the fire-box in the ordinary way through the door N.

rlhis furnace can readily be adapted to use upon railroads, stationary engines, puddling, welding, and heating furnaces.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is v 1. The combination, with a fire-box or furnace, of a retort provided with charging and discharging openings having covers, and of a gas-discharge pipe, substantially as described.

2. rlhe conibinatiomwith a fire-box, ol' a retort formed with an opening, b, and arranged IOO substantially as described.4 or tubes E E, substantially as described.

3. In a furnace, the combinutiomwith are- 5. In a, furnace, the combiuatiomwith a firebox,of retortsarranged abovethere-box, and box formed with an opening, h, of retorts B 5 formed with openings that are closed by mov- B', slides C, formed with lugs n, and pipes or 15 above said fire-box, a. slide C, and a tube, E, l C, formed with a lug, n, and connecting pipes able slides, said retorts being provided with tubes E, substantially as described.

tubes, as E E, substantially as described. ANTON HARDT.

4. In a furnace, the combination, with the -Witnesses: fire-box, of retorts arranged above said re- H. H. BLACKBURN,

:o box, aud supported bywater-pipesa a, aslide, l HARVEY B. LEAoH. 

